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Update README.md

Update README.md #9

---
name: Validate PR head branch
on:
pull_request:
branches:
- ros2
jobs:
check-head-branch:
runs-on: ubuntu-latest
steps:
- name: Check allowed branches
run: |
pattern="^[0-9]+\.[0-9]+\.[0-9]+-[0-9]{8}$" # This regex matches the X.X.X-YYYYMMDD pattern
if [[ "${{ github.head_ref }}" == *"hotfix"* ]]; then
echo "PR from a branch containing 'hotfix' is allowed."
exit 0
elif [[ "${{ github.head_ref }}" =~ $pattern ]]; then
echo "PR from a branch matching X.X.X-YYYYMMDD pattern is allowed."
exit 0
else
echo "PRs must come from branches containing 'hotfix' phrase or matching X.X.X-YYYYMMDD pattern."
exit 1
fi